Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5271aaf15d7b3ec…

MALICIOUS

PDF

41.1 KB Created: 2020-11-01 10:32:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: eed9da1f63160dd3e414d41b83cb9a85 SHA-1: fe36a20d54fe2b6b0f444f875630ee9db434201a SHA-256: d5271aaf15d7b3ec5bba591d834c3df3f7060a12e062f4a5daa28dc7d8fb56a5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to suspicious or disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and contains URLs that are likely part of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/123?keyword=the+interlopers+short+story+theme In PDF document text
    • https://wotafoxig.weebly.com/uploads/1/3/4/3/134306194/fefakop-jumogexu-rutavu.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/vesutigar-maruzaxurenokis-toregitefa-gedufepogos.pdfIn PDF document text
    • https://dajapofijakaf.weebly.com/uploads/1/3/4/2/134266914/3e734c1.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/jojufopolog.pdfIn PDF document text
    • https://dubutabinagi.weebly.com/uploads/1/3/4/4/134441981/xonituz_loluraj.pdfIn PDF document text
    • https://logudapixifoke.weebly.com/uploads/1/3/4/3/134371583/rinabivepifutidos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bakoloj/bill_burr_snl_mafia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4437/9551/files/amana_electric_dryer_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/2163/7064/files/cido_tranexmico_uso_topico.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/jupegenifiru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6085/3920/files/nccn_guidelines_gastric_cancer_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7504/1948/files/47692940771.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5778/2694/files/6838623334.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6514 4900 bytes
SHA-256: c38d519f317511210780079056aa46a1b5e4a11370a3ec056e81b64a56302ea9
font_01_sfnt_off0000759b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x759B 9928 bytes
SHA-256: 5155bf5383ba0d29bf264407f06b0872d3a774e4e51657683d221e8a6b801b7b

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